Richard Wonsub Moon, MD
Internal Medicine Physician · San Diego, CA
Richard Wonsub Moon, MD is an internal medicine physician with a practice address in San Diego, California, and NPI 1396893210, issued on Jan 8, 2007. Check the license (California A84624, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Richard Wonsub Moon
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A84624 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4647 Zion Ave, San Diego, CA 92120
- Phone
- (619) 528-5000
- Enumerated
- Jan 8, 2007
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20041015000663); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4647 Zion Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Richard Wonsub Moon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A84624Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
620 Medicare Part D claims for 224 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 36 claims were for opioids.
Most prescribed
- Ciprofloxacin Hcl44 claims
- Furosemide36 claims
- Prednisone28 claims
- Albuterol Sulfate Hfa27 claims
- Cefuroxime22 claims
- Amlodipine Besylate19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Marcos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Richard Wonsub Moon among 17,696 internal medicine physician records in California
Richard Wonsub Moon, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Diego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Wilfredo Abesamis, M.D.San Diego, CA 921201992754832
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- Fred Corey, M.D.San Diego, CA 921201912989674
- Elaine Gertser, MDSan Diego, CA 921201992719967
- Joanne Keenan, D.O.San Diego, CA 921201043281074
- Hyunsoo Kim, MDSan Diego, CA 921201598789737
- Murray Kornblit, M.D.San Diego, CA 921201932181682
Common questions
What is Richard Wonsub Moon, MD's NPI number?
Richard Wonsub Moon, MD's National Provider Identifier (NPI) is 1396893210, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Richard Wonsub Moon, MD located?
The NPPES record lists a practice address at 4647 Zion Ave, San Diego, CA, 92120. Phone: (619) 528-5000. Providers update this record themselves, so call before visiting.
How can I verify Richard Wonsub Moon, MD's license?
NPPES lists California license number A84624, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Richard Wonsub Moon, MD prescribe under Medicare Part D?
In 2024, Richard Wonsub Moon, MD had 620 Medicare Part D claims for 224 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.